1637361361 has 2 divisors, whose sum is σ = 1637361362. Its totient is φ = 1637361360.

The previous prime is 1637361359. The next prime is 1637361367. The reversal of 1637361361 is 1631637361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1382352400 + 255008961 = 37180^2 + 15969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1637361361 - 2¹ = 1637361359 is a prime.

Together with 1637361359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1637361361.

It is not a weakly prime, because it can be changed into another prime (1637361367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 818680680 + 818680681.

It is an arithmetic number, because the mean of its divisors is an integer number (818680681).

Almost surely, 2^1637361361 is an apocalyptic number.

It is an amenable number.

1637361361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1637361361 is an equidigital number, since it uses as much as digits as its factorization.

1637361361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 1637361361 is about 40464.3220751318. The cubic root of 1637361361 is about 1178.6409137033.

The spelling of 1637361361 in words is "one billion, six hundred thirty-seven million, three hundred sixty-one thousand, three hundred sixty-one".